vm

package
v0.0.0-...-0893d3e Latest Latest
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 Go to latest Published: Dec 18, 2024 License: MIT Imports: 23 Imported by: 0

Documentation

Overview

Package vm contains the Elk Virtual Machine. It interprets Elk Bytecode produced by the Elk compiler.

Index

Constants

View Source 
const (
	UpvalueLongIndexFlag bitfield.BitFlag8 = 1 << iota
	UpvalueLocalFlag
)
View Source 
const CallFrameSize = unsafe.Sizeof(CallFrame{})
View Source 
const ClosureTerminatorFlag byte = 0xff

Variables

View Source 
var CALL_STACK_SIZE int
View Source 
var DeletedHashSetValue value.Value = value.Ref(DeletedHashSetValueType{})
View Source 
var VALUE_STACK_SIZE int

Functions

func Accessor 

func Accessor(
	container *value.MethodContainer,
	attrName string,
)

Utility method that creates a new setter and getter method and attaches them as methods to the given container. Panics when the methods cannot be defined.

func Alias 

func Alias(container *value.MethodContainer, newName, oldName string)

Utility method that defines an alternative name for an existing method.

func ArrayListContains 

func ArrayListContains(vm *VM, list *value.ArrayList, val value.Value) (bool, value.Value)

func ArrayListEqual 

func ArrayListEqual(vm *VM, x, y *value.ArrayList) (bool, value.Value)

func ArrayTupleContains 

func ArrayTupleContains(vm *VM, tuple *value.ArrayTuple, val value.Value) (bool, value.Value)

func ArrayTupleEqual 

func ArrayTupleEqual(vm *VM, x, y *value.ArrayTuple) (bool, value.Value)

func BeginlessClosedRangeContains 

func BeginlessClosedRangeContains(vm *VM, r *value.BeginlessClosedRange, val value.Value) (bool, value.Value)

Checks whether a value is contained in the beginless closed range

func BeginlessClosedRangeEqual 

func BeginlessClosedRangeEqual(vm *VM, x, y *value.BeginlessClosedRange) (bool, value.Value)

Checks whether two beginless closed ranges are equal

func BeginlessOpenRangeContains 

func BeginlessOpenRangeContains(vm *VM, r *value.BeginlessOpenRange, val value.Value) (bool, value.Value)

Checks whether a value is contained in the open range

func BeginlessOpenRangeEqual 

func BeginlessOpenRangeEqual(vm *VM, x, y *value.BeginlessOpenRange) (bool, value.Value)

Checks whether two open ranges are equal

func ClosedRangeContains 

func ClosedRangeContains(vm *VM, r *value.ClosedRange, val value.Value) (bool, value.Value)

Checks whether a value is contained in the closed range

func ClosedRangeEqual 

func ClosedRangeEqual(vm *VM, x *value.ClosedRange, y *value.ClosedRange) (bool, value.Value)

Checks whether two closed ranges are equal

func ClosedRangeIteratorNext 

func ClosedRangeIteratorNext(vm *VM, i *value.ClosedRangeIterator) (value.Value, value.Value)

Get the next element of the range

func Decrement 

func Decrement(vm *VM, val value.Value) (value.Value, value.Value)

Decrement the given value

func Def 

func Def(
	container *value.MethodContainer,
	name string,
	function NativeFunction,
	opts ...DefOption,
)

Utility method that creates a new native method and attaches it to the given container.

Panics when the method cannot be defined.

func DefineAccessor 

func DefineAccessor(
	container *value.MethodContainer,
	attrName value.Symbol,
)

Utility method that creates a new setter and getter method and attaches them as methods to the given method map.

func DefineGetter 

func DefineGetter(
	container *value.MethodContainer,
	name value.Symbol,
)

Creates a getter method and attaches it to the given container.

func DefineNativeMethod 

func DefineNativeMethod(
	container *value.MethodContainer,
	name value.Symbol,
	params int,
	optParams int,
	function NativeFunction,
) (err value.Value)

Define a native method in the given container. Returns an error when the method couldn't be defined.

func DefineSetter 

func DefineSetter(
	container *value.MethodContainer,
	attrName value.Symbol,
)

Creates a setter method and attaches it to the given container.

func EndlessClosedRangeContains 

func EndlessClosedRangeContains(vm *VM, r *value.EndlessClosedRange, val value.Value) (bool, value.Value)

Checks whether a value is contained in the closed range

func EndlessClosedRangeEqual 

func EndlessClosedRangeEqual(vm *VM, x *value.EndlessClosedRange, y *value.EndlessClosedRange) (bool, value.Value)

Checks whether two closed ranges are equal

func EndlessClosedRangeIteratorNext 

func EndlessClosedRangeIteratorNext(vm *VM, i *value.EndlessClosedRangeIterator) (value.Value, value.Value)

Get the next element of the range

func EndlessOpenRangeContains 

func EndlessOpenRangeContains(vm *VM, r *value.EndlessOpenRange, val value.Value) (bool, value.Value)

Checks whether a value is contained in the endless open range

func EndlessOpenRangeEqual 

func EndlessOpenRangeEqual(vm *VM, x, y *value.EndlessOpenRange) (bool, value.Value)

Checks whether two Endless open ranges are equal

func EndlessOpenRangeIteratorNext 

func EndlessOpenRangeIteratorNext(vm *VM, i *value.EndlessOpenRangeIterator) (value.Value, value.Value)

Get the next element of the range

func Equal 

func Equal(vm *VM, left, right value.Value) (value.Value, value.Value)

Check whether two values are equal

func Getter 

func Getter(
	container *value.MethodContainer,
	name string,
)

Utility method that creates a new getter method and attaches it as a method to the given container. It panics when the method cannot be defined.

func GreaterThan 

func GreaterThan(vm *VM, left, right value.Value) (value.Value, value.Value)

Check whether the left value is greater than the right

func GreaterThanEqual 

func GreaterThanEqual(vm *VM, left, right value.Value) (value.Value, value.Value)

Check whether the left value is greater than or equal to the right

func Hash 

func Hash(vm *VM, key value.Value) (value.UInt64, value.Value)

Calculate the hash for the given value

func HashMapConcat 

func HashMapConcat(vm *VM, x *value.HashMap, y *value.HashMap) (*value.HashMap, value.Value)

Create a new map containing the pairs of both maps.

func HashMapContains 

func HashMapContains(vm *VM, hashMap *value.HashMap, pair *value.Pair) (bool, value.Value)

Check if the given pair is present in the map

func HashMapContainsKey 

func HashMapContainsKey(vm *VM, hashMap *value.HashMap, key value.Value) (bool, value.Value)

Check if the given key is present in the map

func HashMapContainsValue 

func HashMapContainsValue(vm *VM, hashMap *value.HashMap, val value.Value) (bool, value.Value)

Check if the given value is present in the map

func HashMapCopy 

func HashMapCopy(vm *VM, target *value.HashMap, source *value.HashMap) value.Value

Copy the pairs of one hashmap to the other.

func HashMapCopyTable 

func HashMapCopyTable(vm *VM, target *value.HashMap, source []value.Pair) value.Value

func HashMapDelete 

func HashMapDelete(vm *VM, hashMap *value.HashMap, key value.Value) (bool, value.Value)

Delete the given key from the hashMap

func HashMapEqual 

func HashMapEqual(vm *VM, x *value.HashMap, y *value.HashMap) (bool, value.Value)

Checks whether two hash maps are equal

func HashMapGet 

func HashMapGet(vm *VM, hashMap *value.HashMap, key value.Value) (value.Value, value.Value)

Get the element under the given key. Returns (value, undefined) when the value has been found. Returns (undefined, undefined) when the key is not present. Returns (undefined, err) when there was an error.

func HashMapGrow 

func HashMapGrow(vm *VM, hashMap *value.HashMap, newSlots int) value.Value

Add additional n empty slots for new elements.

func HashMapIndex 

func HashMapIndex(vm *VM, hashMap *value.HashMap, key value.Value) (int, value.Value)

Get the index that the key should be inserted into. Returns (nil, err) when an error has been encountered. Returns (-1, nil) when there's no room for new values.

func HashMapLaxEqual 

func HashMapLaxEqual(vm *VM, x *value.HashMap, y *value.HashMap) (bool, value.Value)

Checks whether two hash maps are equal (lax)

func HashMapSet 

func HashMapSet(vm *VM, hashMap *value.HashMap, key, val value.Value) value.Value

Set a value under the given key.

func HashMapSetCapacity 

func HashMapSetCapacity(vm *VM, hashMap *value.HashMap, capacity int) value.Value

Resize the given hashmap to the desired capacity.

func HashMapSetWithMaxLoad 

func HashMapSetWithMaxLoad(vm *VM, hashMap *value.HashMap, key, val value.Value, maxLoad float64) value.Value

func HashRecordConcat 

func HashRecordConcat(vm *VM, x *value.HashRecord, y *value.HashRecord) (*value.HashMap, value.Value)

Create a new map containing the pairs of both maps.

func HashRecordContains 

func HashRecordContains(vm *VM, hrec *value.HashRecord, pair *value.Pair) (bool, value.Value)

Check if the given pair is present in the record

func HashRecordContainsKey 

func HashRecordContainsKey(vm *VM, hrec *value.HashRecord, key value.Value) (bool, value.Value)

Check if the given key is present in the record

func HashRecordContainsValue 

func HashRecordContainsValue(vm *VM, hrec *value.HashRecord, val value.Value) (bool, value.Value)

Check if the given value is present in the record

func HashRecordCopy 

func HashRecordCopy(vm *VM, target *value.HashRecord, source *value.HashRecord) value.Value

Copy the pairs of one hash record to the other.

func HashRecordCopyTable 

func HashRecordCopyTable(vm *VM, target *value.HashRecord, source []value.Pair) value.Value

func HashRecordDelete 

func HashRecordDelete(vm *VM, hashRecord *value.HashRecord, key value.Value) (bool, value.Value)

Delete the given key from the hashMap

func HashRecordEqual 

func HashRecordEqual(vm *VM, x *value.HashRecord, y *value.HashRecord) (bool, value.Value)

Checks whether two hash records are equal

func HashRecordGet 

func HashRecordGet(vm *VM, hashRecord *value.HashRecord, key value.Value) (value.Value, value.Value)

Get the element under the given key.

func HashRecordGrow 

func HashRecordGrow(vm *VM, hashRecord *value.HashRecord, newSlots int) value.Value

Add additional n empty slots for new elements.

func HashRecordLaxEqual 

func HashRecordLaxEqual(vm *VM, x *value.HashRecord, y *value.HashRecord) (bool, value.Value)

Checks whether two hash records are equal (lax)

func HashRecordSet 

func HashRecordSet(vm *VM, hashRecord *value.HashRecord, key, val value.Value) value.Value

Set a value under the given key.

func HashRecordSetCapacity 

func HashRecordSetCapacity(vm *VM, hashRecord *value.HashRecord, capacity int) value.Value

Resize the given hash record to the desired capacity.

func HashRecordSetWithMaxLoad 

func HashRecordSetWithMaxLoad(vm *VM, hashRecord *value.HashRecord, key, val value.Value, maxLoad float64) value.Value

func HashSetAppend 

func HashSetAppend(vm *VM, set *value.HashSet, val value.Value) value.Value

Set a value under the given key.

func HashSetAppendWithMaxLoad 

func HashSetAppendWithMaxLoad(vm *VM, set *value.HashSet, val value.Value, maxLoad float64) value.Value

func HashSetContains 

func HashSetContains(vm *VM, set *value.HashSet, val value.Value) (bool, value.Value)

Check whether the given value is contained within the set.

func HashSetCopy 

func HashSetCopy(vm *VM, target *value.HashSet, source *value.HashSet) value.Value

Copy the pairs of one hashmap to the other.

func HashSetCopyTable 

func HashSetCopyTable(vm *VM, target *value.HashSet, source []value.Value) value.Value

func HashSetDelete 

func HashSetDelete(vm *VM, hashSet *value.HashSet, val value.Value) (bool, value.Value)

Delete the given value from the hash set

func HashSetEqual 

func HashSetEqual(vm *VM, x *value.HashSet, y *value.HashSet) (bool, value.Value)

Checks whether two hash sets are equal

func HashSetGrow 

func HashSetGrow(vm *VM, set *value.HashSet, newSlots int) value.Value

Add additional n empty slots for new elements.

func HashSetIndex 

func HashSetIndex(vm *VM, set *value.HashSet, val value.Value) (int, value.Value)

Get the index that the value should be inserted into. Returns (0, err) when an error has been encountered. Returns (-1, undefined) when there's no room for new values.

func HashSetIntersection 

func HashSetIntersection(vm *VM, x *value.HashSet, y *value.HashSet) (*value.HashSet, value.Value)

Create a new set that is the intersection of the given two sets

func HashSetSetCapacity 

func HashSetSetCapacity(vm *VM, set *value.HashSet, capacity int) value.Value

Resize the given set to the desired capacity.

func HashSetUnion 

func HashSetUnion(vm *VM, x *value.HashSet, y *value.HashSet) (*value.HashSet, value.Value)

Create a new set that is the union of the given two sets

func Increment 

func Increment(vm *VM, val value.Value) (value.Value, value.Value)

Increment the given value

func InitGlobalEnvironment 

func InitGlobalEnvironment()

func LaxEqual 

func LaxEqual(vm *VM, left, right value.Value) (value.Value, value.Value)

Check whether two values are equal (lax)

func LeftOpenRangeContains 

func LeftOpenRangeContains(vm *VM, r *value.LeftOpenRange, val value.Value) (bool, value.Value)

Checks whether a value is contained in the left open range

func LeftOpenRangeEqual 

func LeftOpenRangeEqual(vm *VM, x, y *value.LeftOpenRange) (bool, value.Value)

Checks whether two left open ranges are equal

func LeftOpenRangeIteratorNext 

func LeftOpenRangeIteratorNext(vm *VM, i *value.LeftOpenRangeIterator) (value.Value, value.Value)

Get the next element of the range

func LessThan 

func LessThan(vm *VM, left, right value.Value) (value.Value, value.Value)

Check whether the left value is less than the right

func LessThanEqual 

func LessThanEqual(vm *VM, left, right value.Value) (value.Value, value.Value)

Check whether the left value is less than or equal to the right

func MustNewHashMapWithCapacityAndElements 

func MustNewHashMapWithCapacityAndElements(vm *VM, capacity int, elements ...value.Pair) *value.HashMap

func MustNewHashMapWithElements 

func MustNewHashMapWithElements(vm *VM, elements ...value.Pair) *value.HashMap

Create a new hashmap with the given entries.

func MustNewHashRecordWithCapacityAndElements 

func MustNewHashRecordWithCapacityAndElements(vm *VM, capacity int, elements ...value.Pair) *value.HashRecord

func MustNewHashRecordWithElements 

func MustNewHashRecordWithElements(vm *VM, elements ...value.Pair) *value.HashRecord

Create a new hash record with the given entries.

func MustNewHashSetWithCapacityAndElements 

func MustNewHashSetWithCapacityAndElements(vm *VM, capacity int, elements ...value.Value) *value.HashSet

func MustNewHashSetWithCapacityAndElementsMaxLoad 

func MustNewHashSetWithCapacityAndElementsMaxLoad(vm *VM, capacity int, maxLoad float64, elements ...value.Value) *value.HashSet

func MustNewHashSetWithElements 

func MustNewHashSetWithElements(vm *VM, elements ...value.Value) *value.HashSet

Create a new hash set with the given entries.

func NewHashMapComparer 

func NewHashMapComparer(opts *cmp.Options) cmp.Option

func NewHashMapWithCapacityAndElements 

func NewHashMapWithCapacityAndElements(vm *VM, capacity int, elements ...value.Pair) (*value.HashMap, value.Value)

func NewHashMapWithElements 

func NewHashMapWithElements(vm *VM, elements ...value.Pair) (*value.HashMap, value.Value)

Create a new hashmap with the given entries.

func NewHashRecordComparer 

func NewHashRecordComparer(opts *cmp.Options) cmp.Option

func NewHashRecordWithCapacityAndElements 

func NewHashRecordWithCapacityAndElements(vm *VM, capacity int, elements ...value.Pair) (*value.HashRecord, value.Value)

func NewHashRecordWithElements 

func NewHashRecordWithElements(vm *VM, elements ...value.Pair) (*value.HashRecord, value.Value)

Create a new hash record with the given entries.

func NewHashSetComparer 

func NewHashSetComparer(opts *cmp.Options) cmp.Option

func NewHashSetWithCapacityAndElements 

func NewHashSetWithCapacityAndElements(vm *VM, capacity int, elements ...value.Value) (*value.HashSet, value.Value)

func NewHashSetWithCapacityAndElementsMaxLoad 

func NewHashSetWithCapacityAndElementsMaxLoad(vm *VM, capacity int, maxLoad float64, elements ...value.Value) (*value.HashSet, value.Value)

func NewHashSetWithElements 

func NewHashSetWithElements(vm *VM, elements ...value.Value) (*value.HashSet, value.Value)

Create a new hash set with the given entries.

func NewNativeMethodComparer 

func NewNativeMethodComparer() cmp.Option

func ObjectHash 

func ObjectHash(val value.Value) value.UInt64

func OpenRangeContains 

func OpenRangeContains(vm *VM, r *value.OpenRange, val value.Value) (bool, value.Value)

Checks whether a value is contained in the open range

func OpenRangeEqual 

func OpenRangeEqual(vm *VM, x *value.OpenRange, y *value.OpenRange) (bool, value.Value)

Checks whether two open ranges are equal

func OpenRangeIteratorNext 

func OpenRangeIteratorNext(vm *VM, i *value.OpenRangeIterator) (value.Value, value.Value)

Get the next element of the range

func PairEqual 

func PairEqual(vm *VM, x *value.Pair, y *value.Pair) (bool, value.Value)

Checks whether two pairs are equal

func RightOpenRangeContains 

func RightOpenRangeContains(vm *VM, r *value.RightOpenRange, val value.Value) (bool, value.Value)

Checks whether a value is contained in the range

func RightOpenRangeEqual 

func RightOpenRangeEqual(vm *VM, x, y *value.RightOpenRange) (bool, value.Value)

Checks whether two right open ranges are equal

func RightOpenRangeIteratorNext 

func RightOpenRangeIteratorNext(vm *VM, i *value.RightOpenRangeIterator) (value.Value, value.Value)

Get the next element of the range

func Setter 

func Setter(
	container *value.MethodContainer,
	attrName string,
)

Utility method that creates a new setter method and attaches it as a method to the given container. Panics when the method cannot be defined.

Types

type BytecodeFunction 

type BytecodeFunction struct {
	Instructions []byte
	Values       []value.Value // The value pool
	LineInfoList bytecode.LineInfoList
	Location     *position.Location
	Doc          value.Value
	CatchEntries []*CatchEntry
	UpvalueCount int
	// contains filtered or unexported fields
}

A single unit of Elk bytecode.

func NewBytecodeFunction 

func NewBytecodeFunction(
	name value.Symbol,
	instruct []byte,
	loc *position.Location,
	lineInfo bytecode.LineInfoList,
	paramCount int,
	optParamCount int,
	values []value.Value,
) *BytecodeFunction

Create a new bytecode method.

func NewBytecodeFunctionNoParams 

func NewBytecodeFunctionNoParams(
	name value.Symbol,
	instruct []byte,
	loc *position.Location,
	lineInfo bytecode.LineInfoList,
	values []value.Value,
) *BytecodeFunction

Create a new bytecode method.

func NewBytecodeFunctionSimple 

func NewBytecodeFunctionSimple(name value.Symbol, instruct []byte, loc *position.Location) *BytecodeFunction

Create a new bytecode method.

func NewBytecodeFunctionWithCatchEntries 

func NewBytecodeFunctionWithCatchEntries(
	name value.Symbol,
	instruct []byte,
	loc *position.Location,
	lineInfo bytecode.LineInfoList,
	params int,
	optParamCount int,
	values []value.Value,
	catchEntries []*CatchEntry,
) *BytecodeFunction

Create a new bytecode method.

func NewBytecodeFunctionWithOptions 

func NewBytecodeFunctionWithOptions(opts ...BytecodeFunctionOption) *BytecodeFunction

Create a new bytecode method with options.

func NewBytecodeFunctionWithUpvalues 

func NewBytecodeFunctionWithUpvalues(
	name value.Symbol,
	instruct []byte,
	loc *position.Location,
	lineInfo bytecode.LineInfoList,
	params int,
	optParamCount int,
	values []value.Value,
	upvalueCount int,
) *BytecodeFunction

Create a new bytecode method.

func (*BytecodeFunction) AddBytes 

func (f *BytecodeFunction) AddBytes(bytes ...byte)

Add bytes to the bytecode chunk.

func (*BytecodeFunction) AddInstruction 

func (f *BytecodeFunction) AddInstruction(lineNumber int, op bytecode.OpCode, bytes ...byte)

Add an instruction to the bytecode chunk.

func (*BytecodeFunction) AddParameter 

func (f *BytecodeFunction) AddParameter()

Add a parameter to the method.

func (*BytecodeFunction) AddValue 

func (f *BytecodeFunction) AddValue(obj value.Value) (int, IntSize)

Add a value to the value pool. Returns the index of the constant.

func (*BytecodeFunction) AppendUint16 

func (f *BytecodeFunction) AppendUint16(n uint16)

Append two bytes to the bytecode chunk.

func (*BytecodeFunction) AppendUint32 

func (f *BytecodeFunction) AppendUint32(n uint32)

Append four bytes to the bytecode chunk.

func (*BytecodeFunction) Class 

func (*BytecodeFunction) Class() *value.Class

func (*BytecodeFunction) Copy 

func (b *BytecodeFunction) Copy() value.Reference

func (*BytecodeFunction) DirectClass 

func (*BytecodeFunction) DirectClass() *value.Class

func (*BytecodeFunction) Disassemble 

func (f *BytecodeFunction) Disassemble(output io.Writer) error

Disassemble the bytecode chunk and write the output to a writer.

func (*BytecodeFunction) DisassembleInstruction 

func (f *BytecodeFunction) DisassembleInstruction(output io.Writer, offset int) (int, error)

func (*BytecodeFunction) DisassembleStdout 

func (f *BytecodeFunction) DisassembleStdout()

Disassemble the bytecode chunk and write the output to stdout.

func (*BytecodeFunction) DisassembleString 

func (f *BytecodeFunction) DisassembleString() (string, error)

Disassemble the bytecode chunk and return a string containing the result.

func (*BytecodeFunction) Error 

func (b *BytecodeFunction) Error() string

func (*BytecodeFunction) FileName 

func (b *BytecodeFunction) FileName() string

func (*BytecodeFunction) GetLineNumber 

func (b *BytecodeFunction) GetLineNumber(ip int) int

func (*BytecodeFunction) IncrementOptionalParameterCount 

func (b *BytecodeFunction) IncrementOptionalParameterCount()

func (*BytecodeFunction) Inspect 

func (b *BytecodeFunction) Inspect() string

func (*BytecodeFunction) InstanceVariables 

func (*BytecodeFunction) InstanceVariables() value.SymbolMap

func (*BytecodeFunction) Name 

func (b *BytecodeFunction) Name() value.Symbol

func (*BytecodeFunction) OptionalParameterCount 

func (b *BytecodeFunction) OptionalParameterCount() int

func (*BytecodeFunction) ParameterCount 

func (b *BytecodeFunction) ParameterCount() int

func (*BytecodeFunction) RemoveByte 

func (f *BytecodeFunction) RemoveByte()

Add an instruction to the bytecode chunk.

func (*BytecodeFunction) SetOptionalParameterCount 

func (b *BytecodeFunction) SetOptionalParameterCount(optParamCount int)

func (*BytecodeFunction) SetParameterCount 

func (b *BytecodeFunction) SetParameterCount(paramCount int)

func (*BytecodeFunction) SingletonClass 

func (*BytecodeFunction) SingletonClass() *value.Class

type BytecodeFunctionOption 

type BytecodeFunctionOption func(*BytecodeFunction)

func BytecodeFunctionWithInstructions 

func BytecodeFunctionWithInstructions(instructs []byte) BytecodeFunctionOption

func BytecodeFunctionWithLineInfoList 

func BytecodeFunctionWithLineInfoList(lineInfo bytecode.LineInfoList) BytecodeFunctionOption

func BytecodeFunctionWithLocation 

func BytecodeFunctionWithLocation(loc *position.Location) BytecodeFunctionOption

func BytecodeFunctionWithName 

func BytecodeFunctionWithName(name value.Symbol) BytecodeFunctionOption

func BytecodeFunctionWithOptionalParameters 

func BytecodeFunctionWithOptionalParameters(optParams int) BytecodeFunctionOption

func BytecodeFunctionWithParameters 

func BytecodeFunctionWithParameters(params int) BytecodeFunctionOption

func BytecodeFunctionWithStringName 

func BytecodeFunctionWithStringName(name string) BytecodeFunctionOption

type CallFrame 

type CallFrame struct {
	// contains filtered or unexported fields
}

Contains the data of a single function call.

func (CallFrame) FileName 

func (c CallFrame) FileName() string

func (CallFrame) LineNumber 

func (c CallFrame) LineNumber() int

func (CallFrame) Name 

func (c CallFrame) Name() value.Symbol

type CatchEntry 

type CatchEntry struct {
	From        int  // index of the first instruction that can be handled by this catch
	To          int  // index of the last instruction that can be handled by this catch
	JumpAddress int  // index of the byte that the VM should jump to
	Finally     bool // whether this entry is for a finally clause
}

func NewCatchEntry 

func NewCatchEntry(from, to, jumpAddress int, finally bool) *CatchEntry

func (*CatchEntry) ByteRange 

func (c *CatchEntry) ByteRange() int

Number of bytes this catch covers

type Closure 

type Closure struct {
	Bytecode *BytecodeFunction
	Self     value.Value
	Upvalues []*Upvalue
}

Wraps a bytecode function with associated local variables from the outer context

func NewClosure 

func NewClosure(bytecode *BytecodeFunction, self value.Value) *Closure

Create a new closure

func (*Closure) Class 

func (*Closure) Class() *value.Class

func (*Closure) Copy 

func (c *Closure) Copy() value.Reference

func (*Closure) DirectClass 

func (*Closure) DirectClass() *value.Class

func (*Closure) Error 

func (c *Closure) Error() string

func (*Closure) Inspect 

func (c *Closure) Inspect() string

func (*Closure) InstanceVariables 

func (*Closure) InstanceVariables() value.SymbolMap

func (*Closure) SingletonClass 

func (*Closure) SingletonClass() *value.Class

type DefOption 

type DefOption func(*NativeMethod)

func DefWithOptionalParameters 

func DefWithOptionalParameters(optParams int) DefOption

Define how many parameters are optional (have default values). Optional arguments will be populated with `undefined` when no value was given in the call.

func DefWithParameters 

func DefWithParameters(params int) DefOption

Define parameters used by the method

type DeletedHashSetValueType 

type DeletedHashSetValueType struct{}

func (DeletedHashSetValueType) Class 

func (DeletedHashSetValueType) Class() *value.Class

func (DeletedHashSetValueType) Copy 

func (e DeletedHashSetValueType) Copy() value.Reference

func (DeletedHashSetValueType) DirectClass 

func (DeletedHashSetValueType) DirectClass() *value.Class

func (DeletedHashSetValueType) Error 

func (e DeletedHashSetValueType) Error() string

func (DeletedHashSetValueType) Inspect 

func (DeletedHashSetValueType) Inspect() string

func (DeletedHashSetValueType) InstanceVariables 

func (DeletedHashSetValueType) InstanceVariables() value.SymbolMap

func (DeletedHashSetValueType) SingletonClass 

func (DeletedHashSetValueType) SingletonClass() *value.Class

type GetterMethod 

type GetterMethod struct {
	AttributeName value.Symbol
	Doc           value.Value
}

A simple getter method.

func NewGetterMethod 

func NewGetterMethod(attrName value.Symbol) *GetterMethod

Create a new getter method.

func (*GetterMethod) Call 

func (g *GetterMethod) Call(self value.Value) (value.Value, value.Value)

func (*GetterMethod) Class 

func (*GetterMethod) Class() *value.Class

func (*GetterMethod) Copy 

func (g *GetterMethod) Copy() value.Reference

func (*GetterMethod) DirectClass 

func (*GetterMethod) DirectClass() *value.Class

func (*GetterMethod) Error 

func (g *GetterMethod) Error() string

func (*GetterMethod) Inspect 

func (g *GetterMethod) Inspect() string

func (*GetterMethod) InstanceVariables 

func (*GetterMethod) InstanceVariables() value.SymbolMap

func (*GetterMethod) Name 

func (g *GetterMethod) Name() value.Symbol

func (*GetterMethod) NamedRestParameter 

func (*GetterMethod) NamedRestParameter() bool

func (*GetterMethod) OptionalParameterCount 

func (*GetterMethod) OptionalParameterCount() int

func (*GetterMethod) ParameterCount 

func (*GetterMethod) ParameterCount() int

func (*GetterMethod) Parameters 

func (*GetterMethod) Parameters() []value.Symbol

func (*GetterMethod) PostRestParameterCount 

func (*GetterMethod) PostRestParameterCount() int

func (*GetterMethod) SingletonClass 

func (*GetterMethod) SingletonClass() *value.Class

type IntSize 

type IntSize uint8

Size of an integer.

type NativeFunction 

type NativeFunction func(vm *VM, args []value.Value) (returnVal, err value.Value)

An implementation of a native Elk method.

type NativeMethod 

type NativeMethod struct {
	Function NativeFunction
	Doc      value.Value
	// contains filtered or unexported fields
}

A native Elk method

func NewNativeMethod 

func NewNativeMethod(
	name value.Symbol,
	params int,
	optParams int,
	function NativeFunction,
) *NativeMethod

Create a new native method.

func (*NativeMethod) Class 

func (*NativeMethod) Class() *value.Class

func (*NativeMethod) Copy 

func (n *NativeMethod) Copy() value.Reference

func (*NativeMethod) DirectClass 

func (*NativeMethod) DirectClass() *value.Class

func (*NativeMethod) Error 

func (n *NativeMethod) Error() string

func (*NativeMethod) Inspect 

func (n *NativeMethod) Inspect() string

func (*NativeMethod) InstanceVariables 

func (*NativeMethod) InstanceVariables() value.SymbolMap

func (*NativeMethod) Name 

func (n *NativeMethod) Name() value.Symbol

func (*NativeMethod) OptionalParameterCount 

func (n *NativeMethod) OptionalParameterCount() int

func (*NativeMethod) ParameterCount 

func (n *NativeMethod) ParameterCount() int

func (*NativeMethod) SingletonClass 

func (*NativeMethod) SingletonClass() *value.Class

type Option 

type Option func(*VM) // constructor option function

func WithStderr 

func WithStderr(stderr io.Writer) Option

Assign the given io.Writer as the Stderr of the VM.

func WithStdin 

func WithStdin(stdin io.Reader) Option

Assign the given io.Reader as the Stdin of the VM.

func WithStdout 

func WithStdout(stdout io.Writer) Option

Assign the given io.Writer as the Stdout of the VM.

type SetterMethod 

type SetterMethod struct {
	Doc           value.Value
	AttributeName value.Symbol
	// contains filtered or unexported fields
}

A simple setter method.

func NewSetterMethod 

func NewSetterMethod(attrName value.Symbol) *SetterMethod

Create a new getter method.

func (*SetterMethod) Call 

func (s *SetterMethod) Call(self value.Value, val value.Value) (value.Value, value.Value)

func (*SetterMethod) Class 

func (*SetterMethod) Class() *value.Class

func (*SetterMethod) Copy 

func (s *SetterMethod) Copy() value.Reference

func (*SetterMethod) DirectClass 

func (*SetterMethod) DirectClass() *value.Class

func (*SetterMethod) Error 

func (s *SetterMethod) Error() string

func (*SetterMethod) Inspect 

func (s *SetterMethod) Inspect() string

func (*SetterMethod) InstanceVariables 

func (*SetterMethod) InstanceVariables() value.SymbolMap

func (*SetterMethod) Name 

func (s *SetterMethod) Name() value.Symbol

func (*SetterMethod) NamedRestParameter 

func (*SetterMethod) NamedRestParameter() bool

func (*SetterMethod) OptionalParameterCount 

func (*SetterMethod) OptionalParameterCount() int

func (*SetterMethod) ParameterCount 

func (*SetterMethod) ParameterCount() int

func (*SetterMethod) Parameters 

func (*SetterMethod) Parameters() []value.Symbol

func (*SetterMethod) PostRestParameterCount 

func (*SetterMethod) PostRestParameterCount() int

func (*SetterMethod) SingletonClass 

func (*SetterMethod) SingletonClass() *value.Class

type Upvalue 

type Upvalue struct {
	// contains filtered or unexported fields
}

Represents a captured variable from an outer context

func NewUpvalue 

func NewUpvalue(loc *value.Value) *Upvalue

func (*Upvalue) Class 

func (*Upvalue) Class() *value.Class

func (*Upvalue) Copy 

func (v *Upvalue) Copy() value.Reference

func (*Upvalue) DirectClass 

func (*Upvalue) DirectClass() *value.Class

func (*Upvalue) Error 

func (u *Upvalue) Error() string

func (*Upvalue) Inspect 

func (*Upvalue) Inspect() string

func (*Upvalue) InstanceVariables 

func (*Upvalue) InstanceVariables() value.SymbolMap

func (*Upvalue) SingletonClass 

func (*Upvalue) SingletonClass() *value.Class

type VM 

type VM struct {
	Stdin  io.Reader // standard output used by the VM
	Stdout io.Writer // standard input used by the VM
	Stderr io.Writer // standard error used by the VM
	// contains filtered or unexported fields
}

A single instance of the Elk Virtual Machine.

func New 

func New(opts ...Option) *VM

Create a new VM instance.

func (*VM) BuildStackTrace 

func (vm *VM) BuildStackTrace() string

func (*VM) CallCallable 

func (vm *VM) CallCallable(args ...value.Value) (value.Value, value.Value)

Call a callable value from Go code, preserving the state of the VM.

func (*VM) CallClosure 

func (vm *VM) CallClosure(closure *Closure, args ...value.Value) (value.Value, value.Value)

Call an Elk closure from Go code, preserving the state of the VM.

func (*VM) CallMethod 

func (vm *VM) CallMethod(method value.Method, args ...value.Value) (value.Value, value.Value)

func (*VM) CallMethodByName 

func (vm *VM) CallMethodByName(name value.Symbol, args ...value.Value) (value.Value, value.Value)

Call an Elk method from Go code, preserving the state of the VM.

func (*VM) Err 

func (vm *VM) Err() value.Value

Get the stored error.

func (*VM) ErrStackTrace 

func (vm *VM) ErrStackTrace() string

Get the stored error stack trace.

func (*VM) InspectStack 

func (vm *VM) InspectStack()

func (*VM) InterpretREPL 

func (vm *VM) InterpretREPL(fn *BytecodeFunction) (value.Value, value.Value)

Execute the given bytecode chunk.

func (*VM) InterpretTopLevel 

func (vm *VM) InterpretTopLevel(fn *BytecodeFunction) (value.Value, value.Value)

Execute the given bytecode chunk.

func (*VM) PrintError 

func (vm *VM) PrintError()

func (*VM) ResetError 

func (vm *VM) ResetError()

func (*VM) Stack 

func (vm *VM) Stack() []value.Value

func (*VM) StackTop 

func (vm *VM) StackTop() value.Value

Get the value on top of the value stack.

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